Flash Beta:
Took me a while to figure out that "embedded in the browser" really meant that you had to install flash from the app store, but once that misunderstanding was sorted out, I was watching videos and bragging about it on facebook in a matter of minutes.
Email:
Finally the stock client lets you move from one message to the next without having to go back and forth between the list of email. This was seriously lacking. I still use K9 email as well for my non-google accounts as the functionality isn't there to set it up in the stock client. I guess it used to be.
3G Speeds:
About the same, depends on where you are. Hint: If you don't get 3G when moving from Edge network to 3G, go into settings and turn off data then turn it back on. I'm not sure if this is something Tmobile has a problem with or google, either way, it's easy enough to work around.
Speed and Memory:
I'm not a bench market fiend like I used to be. It runs faster, I rarely if ever see any lag in anything I use (not that I saw a lot before). Google says it's 2-5x faster. From what I've seen, I think I'd buy that claim as legit. I think that makes the Nexus One running 2.2 the fastest phone in the world again. Memory usage is FANTASTIC. I used to run with about 90MB free when ending tasks which was fine - now I'm back over 200MB free.
Still missing:
Native DIVX/XVID support. To be on any version greater than beta stage and not have native divx/xvid support is just silly. I know everyone is moving to new standards, but if you're like me and converted your DVDs to Divx over the years and have an existing library set up, it's a pain to convert them over to another format just to watch them on your phone.
What is your favorite new feature? What do you think is missing?